Master Spas
Temperature Regulation Inaccuracy
Water temperature overshoots setpoint by several degrees before heater shuts off
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Temperature sensor out of calibration, Poor sensor placement, Stuck heater relay, Control pack calibration drift
How to Fix / Troubleshooting
Safety first: Monitor water temperature with an independent thermometer to avoid scalding.
- Verify with thermometer: Compare displayed temperature to an accurate thermometer. Note the difference.
- Check sensor placement: Ensure the temperature sensor is fully inserted in the heater tube or well and not touching metal surfaces directly.
- Replace sensor: If readings are consistently off, replace the temperature sensor with a correct Master Spas-compatible part.
- Heater relay check: If the heater continues to run even when the set temperature is reached, the heater relay may be stuck and the control pack should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Temperature Sensor
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